Huawei SUN2000-50KTL-ZHM3 Quick Start Manual page 11

Scenarios Where No Signal Cable Is Connected
If no signal cable is required for the SUN2000, use waterproof plugs to block the wiring holes on
the signal cable connector and connect the signal cable connector to the communications port
on the SUN2000 to improve the waterproof performance of the SUN2000.
(Optional) Connecting the Signal Cable
1. Connect the signal cable to the signal connector.
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